Lithium Citrate:

Lithium Citrate BP
Ph Eur
C6H5Li3O7,4H2O — 282.0 — 6080-58-6

DEFINITION
Trilithium 2-hydroxypropane-1,2,3-tricarboxylate tetrahydrate.
Content: 98.0 per cent to 102.0 per cent (anhydrous substance).

CHARACTERS
Appearance: White or almost white, fine crystalline powder.
Solubility: Freely soluble in water, slightly soluble in ethanol (96 per cent).

IDENTIFICATION
A. When moistened with hydrochloric acid, it gives a red colour to a non-luminous flame.
B. Dilute 3 ml of solution S (see Tests) to 10 ml with water. Add 3 ml of potassium ferriperiodate solution. A white or yellowish-white precipitate is formed.
C. To 1 ml of solution S add 4 ml of water. The solution gives the reaction of citrates.

TESTS
Solution S: Dissolve 10.0 g in carbon dioxide-free water prepared from distilled water and dilute to 100 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
Acidity or alkalinity: To 10 ml of solution S add 0.1 ml of phenolphthalein solution. Not more than 0.2 ml of 0.1 M hydrochloric acid or 0.1 M sodium hydroxide is required to change the colour of the indicator.